Yeah, you can find those easy. Dennis Kirk offers a few different makes. I´d reccomend getting something made for your bike before tweaking the exhaust by hand. I´ve got a friend who chops and redoes these things, and he´ll rely on straight pipes before he builds his own baffles. Rejetting a carb to match a high powered home made exhaust seldom has a happy ending. I don´t think it does much for performance; if so, odds are good it only increases it by small amounts.